Re: [csswg-drafts] [css-nesting] request to pick up the css-nesting proposal

That's theoretically possible, sure; no grammar problems with it. But it means that now there's 3 nesting forms: if you're nesting with a combinator, use it directly (but you *can* use `&` if you want); if you're nesting by just adding more selectors, you have to use `&`; if you're doing anything more complicated, you have to use `@nest`.

The current rules are simpler - when you nest, you need to produce a full new selector with a `&` in it, referring to whatever's matched by the parent selector; if the `&` isn't the very first thing, you have to use `@nest`.  The requirement is straightforward, and the condition for changing to `@nest` is visually obvious. I think this simplicity is pretty valuable!

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